Mid-infrared parameter oscillator

An optical parametric oscillator and parametric oscillator technology, applied in the laser field, can solve problems such as the difficulty in obtaining high-power mid-infrared lasers, the increase in the complexity and volume of lasers, and the increase in the magnification of compressed telescopes, achieving cost-effectiveness, simple structure, low cost effect

Active Publication Date: 2009-12-30
NO 717 INST CHINA MARINE HEAVY IND GRP
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

It can be seen from the above that it is difficult to obtain high-power mid-infrared lasers by directly pumping the KTA optical parametric oscillator at 1.06 μm
[0005] 3. The US patent "monolithic serial optical parametric oscillator" (Patent No. US6344920B1) uses a 1.06μm laser to pump the first-stage non-critical phase-matched KTA optical parametric oscillator to generate a 1.53μm eye-safe laser, and then uses a 1.53μm eye-safe laser Pump the second-stage non-critical phase-matched KTA optical parametric oscillator to achieve 2.59μm signal light and 3.76μm idler light output. This method reduces the quantum number deficit between the signal light and the idler light by increasing the wavelength of the pump light. Small, thus improving the conversion efficiency of mid-infrared idler light, but the first-stage optical parametric oscillator in the patent is an external cavity type. In order to increase the power density of the 1.06μm pump light, it is often nece

Method used

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Embodiment 1

[0026] Such as figure 1 Shown: a kind of mid-infrared optical parametric oscillator, it has a 1.06 μm laser, two-stage optical parametric oscillator and light collecting cavity 5; The first-stage output cavity mirror 10, the first-stage optical parametric oscillator and the second-stage optical parametric oscillator share the second-stage output cavity mirror 13; a xenon lamp 6 and a laser crystal 7 are installed in the focusing cavity 5 . The first-stage optical parametric oscillator is a 1.06 μm pumped intracavity non-critical phase-matched KTA optical parametric oscillator, and the second-stage optical parametric oscillator is a 1.53 μm pumped intracavity non-critical phase-matched KTA optical parametric oscillator. The 1.06 μm laser is a Q-switched laser, and its laser resonator includes a 1.06 μm total anti-cavity mirror 1, a first-stage optical parametric oscillator output cavity mirror 10, and a Q-switching component; the Q-switching component is an electro-optic Q-swit...

Embodiment 2

[0028] Such as figure 2 As shown, the difference from the above-mentioned embodiment 1 is that the Q-switching component of the 1.06 μm laser is composed of two sets of electro-optic crystals 3, a 1 / 4 wave plate 2 and a polarization element 4; that is, the polarization element 4 has two polarization paths , each polarized optical path has a total reflection cavity mirror 1, an electro-optic crystal 3 and a wave plate 2, and the two paths of light are synthesized by the total reflection cavity mirror 1 in the polarization element 4 and propagated to the right as unpolarized light; the first-order optical parameter The oscillator is added with the first-level KTA crystal 14, which has the same cutting angle and coating as the first-level first KTA crystal 9, and its y-axis direction is consistent with another polarization direction of the polarizing element 4; The second-level optical parametric oscillator is added with the second-level KTA crystal 15, which has the same cuttin...

Embodiment 3

[0030] Such as image 3 As shown, the difference from the above-mentioned embodiment 1 is that the 1.06 μm laser is a 1.06 μm passive Q-switched laser or an acousto-optic Q-switched laser, and there is a polarization element 4 in the 1.06 μm resonant cavity, a passive Q-switched component or an acousto-optic Q-switched laser. The components are in different positions in the 1.06 μm laser resonator, such as passive Q-switching components or acousto-optic Q-switching components 16 between the polarization component 4 and the laser crystal 7, or between the full-reverse cavity mirror 1 and the polarization component 4, or Between the laser crystal 7 and the pump light input mirror 8 .

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Abstract

The invention relates to a mid-infrared parameter oscillator, belonging to the technical field of laser. The invention comprises a 1.06mu m laser and a two-level optical parameter oscillator and a light focusing cavity; a laser resonant cavity of the 1.06mu m laser and a first level optical parameter oscillator use a same resonant cavity mirror, the first level optical parameter oscillator and a second level optical parameter oscillator use a same resonant cavity mirror. The two-level optical parameter oscillator of the invention is an inner cavity type non-critical phase matching optical parameter oscillator and the optical parameter conversion receiving angle is large, a walk-off angle is small. The invention can fully use optical power density in a pump optical cavity and optical parameter conversion polarization matched condition to derivate various structures, reduce the technical requirement on pump light of optical parameter oscillator, therefore, the optical parameter conversion efficiency is high and high power mid-infrared laser can be obtained; the structure of the laser is simpler, volume is small, cost is low and overall cost performance is high.

Description

technical field [0001] The invention relates to a mid-infrared optical parametric oscillator, which belongs to the field of laser technology, and specifically relates to the cavity design of the optical parametric oscillator in solid-state laser technology, which is suitable for military use and trace gas detection such as photoelectric countermeasures, biochemical threat detection, and imaging laser radar. Such as: natural gas pipeline leak detection, methane detection in coal mines and other civil fields. Background technique [0002] The optical parametric oscillator is a device that generates mid-infrared laser. It converts near-infrared Nd:YAG 1.06μm laser into 1.5-5μm laser by using frequency down-conversion technology. The optical parametric oscillator is composed of a pump laser, a nonlinear crystal, and an oscillator optical resonator. Under the action of a strong pump light field, the signal light and idler light generated in the nonlinear crystal are gradually est...

Claims

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Application Information

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IPC IPC(8): G02F1/35G02F1/39H01S3/0915H01S3/10
Inventor 刘在洲孙峰赵翔王寿增东芳黄开仁
Owner NO 717 INST CHINA MARINE HEAVY IND GRP
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